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The queryrunner is responsible for running queries and keeping them
up to date. This is required for self-updating queries.
To get this to work properly the ResultProvider/emitter had to be fixed.
The emitter now only lives as long as the client holds a reference to
it, allowing the provider to detect when it is no longer necessary to
keep the query alive (because noone is listening).
In the process various lifetime issues have been fixed, that we're
caused by lambdas capturing smartpointers, that then extended the
lifetime of the associated objects unpredictably.
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